Carburetor



May 5, 1931- w. G. HEGINBOTTOMV I ,6

CARBURETOR Original Filed Feb. 26, 1925 Patented May 5, 1931 UNITEDSTATES PATENT OFFICE WALTER G. HEGINBOTTOM, OF FLINT, MICHIGAN, ASSIGNORTO MARVEL CARBORETOR COMPANY, OF FLINT, MICHIGAN, A CORPORATION OFINDIANA.

osnreunnron Application filed February 26, 1923, Serial No. 621,190.Renewed July 23, 1930.

This invention relates to certain new and useful improvements 'incarburetors, and more particularly to that class of carburetorsemploying a high and low speed jet having I; asuction controlled valvearranged over the high speed nozzle, the object being to provide v meansfor controlling the supply of fuel to the hi h speed nozzle by themovement ofthe throttle so that at any determined range of in speed thesupply to the high speed nozzle can be increased.

Other and further objects and advantages 25 of the invention will behereinafter set forth and the novel features thereof defined by theappended claims. 7

In the drawings, Figure 1 is a side elevation partly in sec- 80 tionshowing my improved construction of carburetor;

Figure 2 is a vertical section through the same; and Figure 3 is adetail section of the valve.

In the drawing I have shown the body of the carburetor constructed oftwo tubular members 1 and 2 connected together, the upper member beingprovided with a heat jacket and the lower member with a lateral airinlet3, but it is, of course, understood that the particular manner offorming the body is immaterial. The lower end of the member 1 is closedby an insert 4 provided with an upwardly extending member which isprovided with an air passage 5 having a venturi 6 arranged inits upperend in which extends a low speed nozzle 7 supplied with fuel by a fuelpassage S'eXtending from the fuel bowl 9 which is provided with theusual float for 50 controlling the supplyof fuel thereto and for A stillfurther object of the invention is to 11, the tension of the springbeing adjusted by a screw 12.

The construction of carburetor thusfar described is substantially thesame as the well known Marvel ty. e of carburetor now in gem oral use;and whlle I have shown certain details of construction, of course, thesecan be modified without departing from the spirit of my invention.

The insert 4 is provided with a valve casing 13 having a fuel passage 14extending therefrom to the fuel bowl 9 and an outlet passage 15 on whichis arranged a highs eed nozzle 16 extending up into the body of thecarburetor above the air inlet and terminating adjacent the free end ofthe suction controlled valve 10. The lower end of the valve casing 13 isclosed by a plug 17 and the upper end is internally threaded in which isscrewed the threaded lower end of a cylinder 18 in which is mounted avalve stem 19 provided with a conical valve 20 at its lower end adaptedto seat on the valve seat 21 formed in the valve-casing, said valve stemextending upwardly through a bearing 22 formed on theupper end of thecylinder and is pro vided with an eye 23 to which is connected anoperating wire 24 connected at its upper end to an arm 25 mounted on astem 26 of a throttle valve 27 arranged in the upper end of the section2.

The stem 19 of the valve is surrounded by a coil. spring 28 for normallyholding the valve on its seat and the valve is provided with a verticalbore 29 which is intersected by a transverse bore 30 forming a fuelpassage which allows a certain amount of fuel "I'll to pass through thevalve to the high speed c nozzle at all times and the calibration of thebores 29 and 30 forming the fuel passage in respect to the size of thehigh speed nozzle is such that when the carburetor is runningatintermediate speed, the high speed nozzle is not supplied with fuel toits full capacity.

m at

As the speed of the motor increases by the opening of the throttle, thevalve is unseated so as to supply the high speed nozzle with its fullcapacity of fuel and in the drawing it will be noted that I have shown acertain amount of slack in the wire 24 connecting the fuel valve to thethrottle valve so that the throttle is allowed to move a predetermineddistance before the valve is unseated to supply additional fuel to thehigh speed nozzle.

While I have shown certain details of construction for controlling thesupply of fuel to the high speed nozzle of a carburetor in Which anozzle is disposed under a suction controlled valve which is normallyheld seated by spring tension, I am aware that the valve can beconstructed in different ways and controlled by operating means ofvarious forms actuated by the movement of the throttle valve, thereforeI do not wish to limit myself to the details of construction of thevalve and operating means as my invention consists broadly in providinga carburetor with a suction controlled valve having a fuel nozzledisposed under the same having a fuel passage of such a size that whenthe engine to which the carburetor is attached is running atintermediate speed, the fuel supplied is less than the full capacity ofthe nozzle and as the speed increases the high speed nozzle is suppliedwith fuel to its full capacity so as to provide for quick accelerationat high speed by increasing the richness of the mixture at the timedesired, 'which in turn is controlled by the movement of the throttle ofthe carburetor.

From the foregoing description it will be seen that I have providedacarburetor with ahi eh and low s )eed nozzle,the supply of fuel to thelow speed nozzle being controlled by a manually operated valve and thesupply of fuel to the high speed nozzle being controlled by a throttleoperated valve so constructed that at intermediate throttle position,the high s eed nozzle delivers a minimum amount of fue to the mixingchamber thereof and at high speed a maximum amount of fuel whereby acarburetor is )rovided so constructed that it meets the demand requiredin the general. type of motor vehicle now in use, by providing means forquick acceleration and increased richness of mixture at high 5 eed.,

In the specification and drawing have shown and described a carburetorwith high and low speed nozzles provided with means for supplying fuelthereto in connection with means for regulating the supply of fuel tothe high speed nozzle by the movement of the throttle valve, but it is,of course, understood that various other constructions for accomplishingthis result can be used without departing from the spirit of myinvention as defined by the claims and therefore I do not wish to limitmyself to the details of construction shown.

What I claim is 1. A carburetor having high and low speed nozzles, athrottle valve, a source of supply having passages leading to saidnozzles, a valve for controlling the amount of fuel delivered to thehigh speed nozzle, said valve having a passage therein for allowing aminimum amount of fuel to pass to said high speed nozzle and meansoperated by the movement of the throttle for actuating said valve forsupplying the maximum amount of fuel to said high speed nozzle.

2. A carburetor'comprising a body having a bore provided with a lateralair inlet at its lower end and a throttle valve at its upper end, a lowspeed nozzle mounted in said bore,

a high speed nozzle arranged in said core, a suction controlled valvemounted in said bore over said high speed nozzle, a fuel bowl forsupplying fuel to said nozzles, a valve for controlling the supply offuel to said high speed nozzle, said valve having a fuel passage forallowing a minimum amount of fuel to pass to said high speed nozzle andmeans operated by the movement of the throttle for unseating said valvefor allowing a maximum amount of fuel to pass to said high speed nozzle,said means being operated by the movement of the throttle.

3. A carburetor comprising a body having a bore provided with an airinlet at its lower end and a throttle controlled outlet, a memberarranged in the lower end of said bore having an air passage providedwith a low speed nozzle, a pivoted suction controlled valve carried bsaid member, a high speed nozzle carried y said member and terminatingadjacent the free end of said suction controlled valve, a fuel bowlcarried by said member, fuel passages extending from said fuel bowl tosaid nozzles, a valve disposed in the fuel passage leading to the highspeed nozzle and having a fuel passage therein for allowing a minimumamount of fuel to pass therethrough and means for connecting said fuelvalve to the throttle valve to move said fuel valve for allowing amaximum amount of fuel to pass th'erethrough upon the movement of saidthrottle valve.

.4. A carburetor comprising a body having,

low and high speed nozzles, a fuel bowl, a

. pivoted suction controlled valve arranged over the high speed nozzle,a fuel passage extending from said bowl to said low speed nozzle, avalve casing, a fuel passage extending from said fuel bowl to said valvecasing, a fuel passage extending from said valve casing to said highspeed nozzle, a valve arranged in said valve casing and having a fuelpassage therein for allowing a predetermined ,amount of fuel to passtherethrough, means for holding said valve seated and means operated bythe movement of the throttle for unseating said valve to increase theamount of fuel passing to said high speed nozzle.

valve to said throttle valve to be moved thereby for increasing thesupply of fuel to said high speed nozzle'by the movement of 'thethrottle valve. I

6. A carburetor comprising a body having a throttle controlled outlet,high and low speed nozzles arranged within said body, a suctioncontrolled valve arranged over said high speed nozzle, a fuel bowl forsupply-- ing fuel to said nozzles, a valve casing in communication withthe source of fuel supply to said high speed nozzle, a valve mountedtherein having a passage therein for allowing a predetermined amount offuel to pass therethrough and a connection between said valve and saidthrottle for unseating said valve to increase the supply of fuel to thehigh speed nozzle.

nozzle at intermediate (1 and a maximum amount of fuel to said 'gh speednozzle at high speed.

10. A carburetor having high and low speed nozzles, a throttle valve, asource of supply having passages leading to said nozzle, a suctioncontrolled valve arranged over said high speed nozzle, a valvecontrolljn the amount of fuel delivered to ,said hig speed nozzle, saidvalve having a' passage therein for allowing a minimum amount of fuel topass to sai high speed nozzle and means controlled by the position ofthe throttle valve for actuating said valve for su plying a maximumamount of fuel to said hi h speed nozzle.

n testimony whereof I hereunto afiix my signature.

.WALTER G. HEGINBOTTOM.

7. A carburetor having high and low speed nozzles and a suctioncontrolled valve arranged over said high speed nozzle, a throttle valveand means for controlling the supply of fuel to said high speed nozzlecomprising a valve having a passage therein for delivering a minimumamount of fuel when seated and a maximum amount of fuel when unseatedand means connected to and operated by the movement of the throttle forunseating said valve.

8. A carburetor having high and low' speed nozzles and a throttle valvefor controlling the outlet thereof, means for supplying fuel to saidhigh and low speed nozz es, a valve for controlling the supply of fuelto said high speed nozzle and having a fuel passage therein forsupplying, a minimum I,

amount of fuel to said nozzle when seated and a maximumamount of fuelwhen unseated and means actuated at a predetermined movement of thethrottle for unseating said valve for increasing the supply of fuel tosaid high speed nozzle.

9. A carburetor having a c'arbureting passage, a throttle valve forcontrolling the pasage of explosive mixture therethrough, a low speednozzle for constantly supplying fuel to said carbureting passage, a highspeed nozzle for supplying fuel to said carbureting passage atintermediate and high speeds, means for supplying and maintaining 'fuelat a predetermined level in said high Speed nozzle and means controlledby the position of the throttle valve for controlling the amount of fueldelivered to the highspeed nozzle, said means comprising a valve havinga passage therein adapted to deliver a minimum amount of fuel to saidhigh speed

